Postby nigecapri » Mon Jul 02, 2018 2:03 pm
Blown with rust!
From above, that's where the water runs off the bonnet channels & into the gap between plastic trim & bonnet in rain or when its washed. Here it will find its way into any paint defect or tiny rust spot etc. accelerating corrosion more than at other points. The bonnet front edge always rusts through from the inside first due to never seeing any paint from new.
Before any repair work it would be worth the price of a bottle of Jenolite or similar fast acting rust killer then with suitable floor protection / cardboard / old curtains, pour some inside the leading edge & lift either side to run it along the joint between top face & underside. When cured & filled, lob some paint in there & run along as per above. This should prevent it rusting through again, which it will do if not treated. Don't bother about profiling a shape into it underneath, just make it as long-lasting as possible.